1//===-- xray_powerpc64.cpp --------------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file is a part of XRay, a dynamic runtime instrumentation system.
10//
11// Implementation of powerpc64 and powerpc64le routines.
12//
13//===----------------------------------------------------------------------===//
14#include "sanitizer_common/sanitizer_common.h"
15#include "xray_defs.h"
16#include "xray_interface_internal.h"
17#include "xray_utils.h"
18#include <atomic>
19#include <cassert>
20#include <cstring>
21
22#ifndef __LITTLE_ENDIAN__
23#error powerpc64 big endian is not supported for now.
24#endif
25
26namespace {
27
28constexpr unsigned long long JumpOverInstNum = 7;
29
30void clearCache(void *Addr, size_t Len) {
31 const size_t LineSize = 32;
32
33 const intptr_t Mask = ~(LineSize - 1);
34 const intptr_t StartLine = ((intptr_t)Addr) & Mask;
35 const intptr_t EndLine = ((intptr_t)Addr + Len + LineSize - 1) & Mask;
36
37 for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
38 asm volatile("dcbf 0, %0" : : "r"(Line));
39 asm volatile("sync");
40
41 for (intptr_t Line = StartLine; Line < EndLine; Line += LineSize)
42 asm volatile("icbi 0, %0" : : "r"(Line));
43 asm volatile("isync");
44}
45
46} // namespace
47
48extern "C" void __clear_cache(void *start, void *end);
49
50namespace __xray {
51
52bool patchFunctionEntry(const bool Enable, uint32_t FuncId,
53 const XRaySledEntry &Sled,
54 void (*Trampoline)()) XRAY_NEVER_INSTRUMENT {
55 const uint64_t Address = Sled.address();
56 if (Enable) {
57 // lis 0, FuncId[16..32]
58 // li 0, FuncId[0..15]
59 *reinterpret_cast<uint64_t *>(Address) =
60 (0x3c000000ull + (FuncId >> 16)) +
61 ((0x60000000ull + (FuncId & 0xffff)) << 32);
62 } else {
63 // b +JumpOverInstNum instructions.
64 *reinterpret_cast<uint32_t *>(Address) =
65 0x48000000ull + (JumpOverInstNum << 2);
66 }
67 clearCache(Addr: reinterpret_cast<void *>(Address), Len: 8);
68 return true;
69}
70
71bool patchFunctionExit(const bool Enable, uint32_t FuncId,
72 const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
73 const uint64_t Address = Sled.address();
74 if (Enable) {
75 // lis 0, FuncId[16..32]
76 // li 0, FuncId[0..15]
77 *reinterpret_cast<uint64_t *>(Address) =
78 (0x3c000000ull + (FuncId >> 16)) +
79 ((0x60000000ull + (FuncId & 0xffff)) << 32);
80 } else {
81 // Copy the blr/b instruction after JumpOverInstNum instructions.
82 *reinterpret_cast<uint32_t *>(Address) =
83 *(reinterpret_cast<uint32_t *>(Address) + JumpOverInstNum);
84 }
85 clearCache(Addr: reinterpret_cast<void *>(Address), Len: 8);
86 return true;
87}
88
89bool patchFunctionTailExit(const bool Enable, const uint32_t FuncId,
90 const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
91 return patchFunctionExit(Enable, FuncId, Sled);
92}
93
94// FIXME: Maybe implement this better?
95bool probeRequiredCPUFeatures() XRAY_NEVER_INSTRUMENT { return true; }
96
97bool patchCustomEvent(const bool Enable, const uint32_t FuncId,
98 const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
99 // FIXME: Implement in powerpc64?
100 return false;
101}
102
103bool patchTypedEvent(const bool Enable, const uint32_t FuncId,
104 const XRaySledEntry &Sled) XRAY_NEVER_INSTRUMENT {
105 // FIXME: Implement in powerpc64?
106 return false;
107}
108
109} // namespace __xray
110
111extern "C" void __xray_ArgLoggerEntry() XRAY_NEVER_INSTRUMENT {
112 // FIXME: this will have to be implemented in the trampoline assembly file
113}
114

source code of compiler-rt/lib/xray/xray_powerpc64.cpp